Thanks Bruce.  I wasn't asking for a formula--rather just wondering why the indicator which is already programmed by TC does not give values that are consistent with other platforms.  Maybe the answer lies in the formula above.  I will check it out.

I am having trouble using the fisher transform(10).  The values it returns and plots are not the same as fisher transform on other platforms?  They are far less in magnitude.  Any idea why that would be?  Is there a different fomula being used?  Thanks